Turbine-nozzle valve.



No. 853,332. PATENTED MAY 14, 1907.

' 0. A. BAOKSTROM.

TURBINE NOZZLE VALVE.

APPLICATION FILED P133. 6, 1904.

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CHARLES A. BACKSTROM, OF MILWAUKEE,

WISCONSIN, ASSIGNOR TO BACK- STROM-SMITH STEAM TURBINE & MANUFACTURING COMPANY, A COR- PORATION OF WVISCONSIN.

TURBINE-NOZZLE VALVE.

Original application filed January 21,

Specification of Letters Patent.

Patented May 14, 1907.

1904, Serial No. 190,043. Divided and this application filed February 6, 1904.

Serial No. 192,319.

To all whm n/ it may concern;

Be it known that I, CHARLEs A. BACK- sTRoM, a citizen of the United States, residing at Milwaukee, county of l\ Iilwauke'e, and

State of Wisconsin, have invented new and useful Improvements in Turbine-Nozzle Valves, of which the following is a specification.

My invention relates to improvements in IO turbine nozzle valves.

The object of my invention is to provide mechanism for regulating the delivery of motive fluid through the nozzles of a turbine, in which there will be no frictional resistance between the nozzle ring or partition and the fluid regulating devices. so to provide means in which there will be theleast possible movement of the regulating parts and their connections within the turbine casing. A further object of this invention is to provide means for uniformly distributing motive fluid to the open nozzles. This application is divisional to another application bearing even date herewith for 2 5 Letters Patent for improvements in turbines, wherein the fluid controlling valve is shown and described but not claimed, the claims therefor being included in this application.

In the following description reference is had the accompanying drawings in which, Figure 1 is a transverse sectional view of a turbine embodying my invention, with portions of the running wheel, the nozzle partition and valve ring broken away to show 5 the valve ports, nozzles and vanes. Figs.

2 and 3'are sectional views drawn on lines ac-x and y-y respectively.

Like parts are identified by the same reference characters in both views.

1 is the shaft of the movable member of the turbine; 2 the hub of a running wheel 3, which is provided with an annular series of vanes 4 arranged for an inward delivery of motive fluid to a cavity 5 within the running wheel, from which cavity the motive fluid is delivered to both sides of the wheel through apertures 6. These parts are shown, described and claimed in a former application for Letters Patent for turbine running wheels-filed by me on the 21st day of January, 1904, serial number 190,043.

x A nozzle ring 7 encircles the vanes 4 and is provided with nozzle apertures 8 through which motive fluid is delivered from the chamber 9 to the vanes. The nozzle ring is preferably supported by partition members 10 and 11 as shown, described and claimed in the divisional application above referred to, but for the purposes of this application any suitable arrangement of stationary par titions or subdivisions of which the nozzle ring 7 forms a part may be employed.

A 'valve ring 14 encircles the nozzle ring and is provided with apertures 15 through which the motive fluid is permitted to pass to the nozzles 8. The valve ring however, does not rest upon the nozzle ring, but is inde pendently supported upon rollers 17, mounted upon pins 18 which project into the cham ber 8 from the partition member 10. The rollers 17 are disposed around the valve ring 14 in a manner to support said ring on all sides so that there will be no resistance of the opposing surfaces of the nozzle ring and valve ring, it being possible to avoid all frictional contact between such surfaces. An arm 20 extends outwardly from the valve ring in the chamber 9 and is connected to a valve actuating arm 21 which extends through suitable stufling boxes in the casing and is provided with an exterior rack 22. Motion is communicated from a valve actuating shaft 23 tothe valve ring 14 through the pinion 24, rack 22, rod 21 and arm 20,

whereby the valve ring is oscillated to bring the port 15 into and out of registry with the nozzles 8.

It will be observed that the oscillation of l the valve ring 14 causes it to cover or uncover the nozzles 8 in succession, each of the remaining open nozzles being permitted to receive fluid at their full capacity.

It will be understood that the nozzles 8 are arranged in groups and any desired number of such groups may be provided so long as a closed area is provided between the groups of a size equal to the dimensions of the valve l ports 15.

l The ring 14 is provided with an outwardly projecting flange over which the motive fluid must pass to reach the aperture 15, the object of this flange being to prevent an unequal distribution of the fluid by causing it to approach the aperture 15 on radial lines. The rollers 17 are preferably reduced at each end and the central portion of each roller entered in a groove 25 in the exterior surface of the valve ring, whereby this ring is prevented from shifting laterally.

Having thus described my invention, what claim as new and desire to secure by Letters Patent is,

1. In a turbine, a nozzle ring having grouped nozzle apertures; and a valve ring concentric with the nozzle ring, and provided with an aperture for each group of nozzles, equal in capacity to the combined capacity of the nozzles in said group; together with anti-friction devices supporting the valve ring out of binding frictional contact with the nozzle ring.

2. In a turbine, a nozzle ring having nozzle apertures; a valve ring concentric with the nozzle ring and provided with ports for the delivery of motive fluid to the nozzles; and a deflecting flange on the valve ring arranged to prevent an annular flow of motive I fluid to the valve ports over the edge of the valve ring.

3. In a turbine; a nozzle ring having a cylindrical outer surface and provided with grouped nozzles arranged for an inward deivery of the motive fluid; a valve ring enciri cling the nozzle ring and provided with ports,

adapted to be brought into and out of registry with the nozzle apertures; a rod connected tangentially with the valve ring and extending to an exterior point; and connections for oscillating said rod.

4. In a turbine, a valve ring apertured for the delivery of motive fluid; and a set of rollers disposed annularly about the valve ring,

and arranged to support such ring; said rollers having a central portion fitting a groove in the valve ring.

In testimony whereof I afliX my signature 5 in the presence of two witnesses.

( CHARLES A. BA'OKSTROM.

Witnesses:

LEVERETT 0. WHEELER, JAS. B. ERWIN. 

